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Patrick Avogadro
09-25-2000, 11:22 PM
Here is a summary of all the answers I got concerning modifications of a monark ergocycle or acquisition of new and more ecological (and accurate) ergocycle.

Thanks to all answerers

Patrick AVOGADRO

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Steve Meyer :

The alternative to either is the SRM ergometer this machine and the
cranks are used by the majority of professional racing teams. The bike
is fully adjustable and can measure power torque and even has adjustable
cranks, you can get details of this on their website www.srm.de

I have modified a Monark by brazing a 1 inch or 22.2 tube in the square
handlebar stem bit, this allows conventional stems to be used including
the Look adjustable stem, a bit pricey but it saves having lots of set
of bars and stems.

A conventional bottom bracket shell can be brazed in to replace the
Monark bottom bracket allowing conventional cranks to be used and
therefore pedals , It also allows you to alter crank length, to fit SRM
power cranks and alter chainring size.

Monark produce a seat post adjustable for and aft as well as up and down
this is a little wobbly but pretty good and allows a conventional saddle
to be used.

The bottom bracket mods were carried out by a frame builder for minimal
cost the remainder I did and I'm no engineer. This quite a good low cost
solution although I think the SRM is the way ahead.

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jason Vance

Regarding modifying a Monark ergometer, it is advisable to start with a
pan-loaded set-up. Salvage the Monark flywheel, loading pan, and resistance
cord or strap. Contact a local or regional bicycle frame-builder and
describe what your needs are based around the Monark flywheel. A custom
frame may be made where the seat is adjustable up and down, fore and aft;
likewise the stem should accommodate a broad range of handlebars and also
should adjust up and down, fore and aft. This should give you the ability to
reproduce almost every bicycle geometry based on the subjects' preferences.

The advantage goes to accessory ergometers where the subjects' personal
bikes may be used. However, a pan-loaded Monark is accurate (probably more
accurate?), but you will accrue extra costs having a new frame built around
it and investing in a broad range of crank-arm lengths and handle-bar widths
to accommodate the individual preferences of each subject.

Good luck in your search and feel free to keep me posted on which option you
choose and how it turns out (I've been looking for a Schwinn Velodyne for a
while...maybe you've come across one?). If you are in the U.S., I can call
up a few builders and see if they are still modifying Monarks (Eisentraut is
one off the top of my head).

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and for french speaking people, an answer of JP Micallef

Pour mesurer la puissance développée par des cyclistes, nous avions
développé il y a quelques années un cyclo ergométre équipé d'
un capteur de tension de chaine qui donnait le couple appliqué par le
cycliste,
un capteur de vitesse pour la mesure de la vitesse instantanée et
un capteur de position de la pédale.
L'intérét du système était de connaitre à chaque instant le couple, la
vitesse et la puissance développée en fonction de la position de la pédale.
En effet, on constate que le cycliste développe des couples très variables
au cours d'un tour de pédale , on peut ainsi détecter ses points faibles.

Par ailleurs,
Philippe CAMPILLO
Université de Lille II
Faculté des sciences du sport
Laboratoire d'Etudes de la Motricité Humaine (L.E.M.H.)
9, rue de l'université
59790 Ronchin (FRANCE)
tel 03 20 88 73 69
fax 03 20 88 73 63

a effectué des mesures de forces sur un pédalier original (manivelle de
longueur variable) en utilisant des capteurs de force disposés sur les
pédales.

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